How to reproduce :

• I create a page named "first page"
• I insert a content inside this first page
• I insert a link to a page managed by the CMS inside this content
• In the assistant to create the link, I click on "Click here to insert a page under the selected page."
  > the assistant of the creation of a page appears
• I name this new page "second page", I select the template and the content article, then I valid
  > at this time, it seems that I am not anymore on the content of the first page but in the content of the second one because I select this second page i the assistant of the creation if the link and finally, the link appears in the content second page.